JSON Firebase URL to Array

Question

I need to get as array a firebase link. I have the following link https://.firebaseio.com/users.json which is going to retrieve the following json file:

{

    "-KOIbPUxKWKMaIOuX1cR": {

        "email": "fillocj.rc@gmail.co",

        "lastName": "Alberto",

        "password": "password",

        "userName": "Rodolfo"

    },

    "-KOOF5S3kDnvsT9nVx85": {

        "email": "test@test2.com",

        "lastName": "TEST",

        "password": "password",

        "userName": "TEST"

    }

}

and I am using the following function in javascript to get make a conversion:

var o = 'https://<myInstance>.firebaseio.com/users.json';

var arr = Object.keys(o).map(function (k) { return o[k] });

console.log(arr)

But the result if this function is the following:

Array[53]



0:"h"

1:"t"

2:"t"

3:"p"

4:"s"

5:":"

6:"/"

7:"/"

8:"a"

9:"g"

10:"u"

11:"l"

12:"a"

13:"r"

14:"f"

15:"i"

16:"r"

17:"e"

18:"d"

And of course this is not what I need, I need to retrieve all emails or all users or all id numbers. Is there any way to retrieve that? Or can somebody help me out with a piece of code which can help me with.

Thanks in advance.

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Answer 1

You can use jQuery map function to map objects.

$.map(source, function(item, i){
    return source.email; //return what you want
});

If you just want to retrieve the json content from the url you need to make an AJAX request. A simple way of doing this is using getJSON function.

    $.getJSON("https://<myInstance>.firebaseio.com/users.json", function(result){
        // here you get the JSON content
    });

Take a look at this snippet:

window.users = {
    "-KOIbPUxKWKMaIOuX1cR": {
        "email": "fillocj.rc@gmail.co",
        "lastName": "Alberto",
        "password": "password",
        "userName": "Rodolfo"
    },
    "-KOOF5S3kDnvsT9nVx85": {
        "email": "test@test2.com",
        "lastName": "TEST",
        "password": "password",
        "userName": "TEST"
    }
};



function getEmails(users){
  return $.map(users, function(item, i){
  	return item.email;
  });
};

function getSampleObject(users){
  return $.map(users, function(item, i){
      return {
        email: item.email,
        username: item.userName
      };
    });
};

$(window).ready(function(){
  var emails, users;
  
  emails = getEmails(window.users);
  users = getSampleObject(window.users);  
  
  $('#output_1').text(JSON.stringify(emails));
  $('#output_2').text(JSON.stringify(users));
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h2>Retrieves email</h2>
<code id="output_1"></code>
<hr />
<h2>Retrieves object</h2>
<code id="output_2"></code>

JSON Firebase URL to Array

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